Shareholders' Equity (Schedule Of Treasury Stock) (Details) - shares	12 Months Ended
	Jul. 31, 2019	Jul. 31, 2018	Jul. 31, 2017
Schedule of Treasury Shares Activity [Roll Forward]
Beginning balance (in shares)	22,871,145
Net issuance upon exercise of stock options (in shares)	(1,103,054)	(738,635)	(978,193)
Ending balance (in shares)	24,324,483	22,871,145
Treasury Stock
Schedule of Treasury Shares Activity [Roll Forward]
Beginning balance (in shares)	22,871,145	21,037,353
Stock repurchases (in shares)	2,636,554	2,642,690
Net issuance upon exercise of stock options (in shares)	(1,057,604)	(723,677)
Issuance under compensation plans (in shares)	(104,483)	(78,304)
Other activity (in shares)	(21,129)	(6,917)
Ending balance (in shares)	24,324,483	22,871,145	21,037,353